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| author | Jesper Dangaard Brouer <brouer@redhat.com> | 2018-05-24 16:45:57 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-05-24 18:36:15 -0700 |
| commit | 38edddb81172e8b8decb057c0cd23271583a5fa0 (patch) | |
| tree | 444ebbb5e686501073401c5836712b819ef03e10 /kernel/bpf/devmap.c | |
| parent | 5d053f9da4311a86bc58be8588bb5660fb3f0724 (diff) | |
| download | op-kernel-dev-38edddb81172e8b8decb057c0cd23271583a5fa0.zip op-kernel-dev-38edddb81172e8b8decb057c0cd23271583a5fa0.tar.gz | |
xdp: add tracepoint for devmap like cpumap have
Notice how this allow us get XDP statistic without affecting the XDP
performance, as tracepoint is no-longer activated on a per packet basis.
V5: Spotted by John Fastabend.
Fix 'sent' also counted 'drops' in this patch, a later patch corrected
this, but it was a mistake in this intermediate step.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/devmap.c')
| -rw-r--r-- | kernel/bpf/devmap.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 15293b9..ff2f3bf 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -58,6 +58,7 @@ #define DEV_MAP_BULK_SIZE 16 struct xdp_bulk_queue { struct xdp_frame *q[DEV_MAP_BULK_SIZE]; + struct net_device *dev_rx; unsigned int count; }; @@ -219,6 +220,7 @@ static int bq_xmit_all(struct bpf_dtab_netdev *obj, struct xdp_bulk_queue *bq) { struct net_device *dev = obj->dev; + int sent = 0, drops = 0; int i; if (unlikely(!bq->count)) @@ -235,11 +237,18 @@ static int bq_xmit_all(struct bpf_dtab_netdev *obj, int err; err = dev->netdev_ops->ndo_xdp_xmit(dev, xdpf); - if (err) + if (err) { + drops++; xdp_return_frame(xdpf); + } else { + sent++; + } } bq->count = 0; + trace_xdp_devmap_xmit(&obj->dtab->map, obj->bit, + sent, drops, bq->dev_rx, dev); + bq->dev_rx = NULL; return 0; } @@ -296,18 +305,28 @@ struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key) /* Runs under RCU-read-side, plus in softirq under NAPI protection. * Thus, safe percpu variable access. */ -static int bq_enqueue(struct bpf_dtab_netdev *obj, struct xdp_frame *xdpf) +static int bq_enqueue(struct bpf_dtab_netdev *obj, struct xdp_frame *xdpf, + struct net_device *dev_rx) + { struct xdp_bulk_queue *bq = this_cpu_ptr(obj->bulkq); if (unlikely(bq->count == DEV_MAP_BULK_SIZE)) bq_xmit_all(obj, bq); + /* Ingress dev_rx will be the same for all xdp_frame's in + * bulk_queue, because bq stored per-CPU and must be flushed + * from net_device drivers NAPI func end. + */ + if (!bq->dev_rx) + bq->dev_rx = dev_rx; + bq->q[bq->count++] = xdpf; return 0; } -int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp) +int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, + struct net_device *dev_rx) { struct net_device *dev = dst->dev; struct xdp_frame *xdpf; @@ -319,7 +338,7 @@ int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp) if (unlikely(!xdpf)) return -EOVERFLOW; - return bq_enqueue(dst, xdpf); + return bq_enqueue(dst, xdpf, dev_rx); } static void *dev_map_lookup_elem(struct bpf_map *map, void *key) |
